Safety-clutch.



No. 788,81@ PATBNTED MAY 2, 1905.

A. A. AMBLER.

SAFETY GLUTGH.

APPLIUATION FILED MAE. 1a. 1904.

3 SHEET-B-BEBBT 1.

we l n www PATENTED MAY 2, 1905.

A. A. AMBLER.

SAFETY CLUTCH. APPLIUATION FILED MAR. 19, 1904.

SSHEETS-SHBBT 2.

PATENTED MAY 2, 1905.

A. A. AMBLER.

SAFETY CLUTCH.

APPLIGATIUN FILED MAR. 19, 1904.

1 wanton rmrd J'mZer,

Eatented May Q, 1905.

UNITED STATES PATENT OEEICE.

ARTHUR A. AMBLER, OF SPRINGFIELD, OI-IIO, ASSIGNOR TO THE FOOSMANUFACTURING COMPANY, OF SPRINGFIELD, OHIO, A CORPORA- TION OF OHIO.

SAFETY-CLUTCH.

SPECIFICATION forming part or' Letters Patent N o. 788,810, dated May 2,1905.

Application filed March 19,' 1904. Serial No. 198,931.

To @ZZ whom it may concern:

Be it known that I, ARTHUR A. AMBLER, a citizen of the UnitedStates,residing at Springfield, in the county of Clark and VState ofOhio, have invented certain new and useful Improvements inSafety-Clutches, oi which the following is a specification, referencebeing h ad therey in to the accompanying' drawings.

This invention relates to safety-clutches, and has for its object toprovide a friction clutch or coupling designed primarily for use inconnection with crushing or breaking rolls, which clutch or couplingwill yield in case hard objects enter the rolls and will thereby preventinjury to the rolls or transmission-gearing.

To these ends my invention consists in certain novel features, which Iwill now proceed to describe and will then particularly point out in theclaims.

In the accompanying drawings, Figure l is an elevation of a breaker orcrusher having my improvement applied thereto. Fig. 2 is a longitudinal:sectional view of the clutch or coupling. Fig. 3 is a side view et' thedriving-sleeve detached. Fig. 4 is an end View of the same. Fig. 5 is aperspective view oi the driving-pinion detached. Fig. 6 is a perspectiveview of the friction-sleeve detached. Fig. 7 is a perspective view ofone ot' 'the members oi the abutment-collar detached, and Fig. 8 is aperspective View ot' the other member oi' the abutment-collar detached.

In the accompanying drawings I have illustrated my invention as appliedto the driving mechanism of a breaker or crusher employed in conjunctionwith grinding-mills, although the invention is of course capable of usewherever a yielding safety coupling or clutch may be necessary.

In the said drawings, l indicates the breaker, which has a driving-shaft2, by means of which the breaking rolls are driven. In breakers of thisclass there is danger of breakage of the rolls or of the driving-gearsby reason of the accidental entry into the breaker of hardsubstances-such as bolt-nuts, nails, or the like-and for this reasonsuch breakers have to a large extent been driven by belts and pulleys inorder to take advantage'o'f the slipping or Iiying oil' of the belt whensuch an obstacle enters the breaker, although in other respects agear-drive is more advantageous'owing to its positive nature, which ismore suited to the character of the work to be done by the breaker.

The main object of my present invention is to provide a constructionwhereby the breaking-rolls may be driven by gearing, at the same timemaking provision for permitting' the driving-train to slip in case ahard object enters the breaker, thus preventing injury to the rolls orgearing.

In the specilic embodiment of my invention shown in the accompanyingdrawings, 3 indicates a gear-wheel mounted on the drivingshat't 2 oi thebreaker, and fl indicates the main shaft ol2 the mill, driven by a beltpassing around the pulley 5 thereon. On the shaft L is secured adriving-sleeve 6, which is held in position in any suitable manner-Jas,for instance, by means of a set-screw 7. This driving-sleeve is providedat one end with a flange or collar 8, its other end being externallythreaded, as indicated at 9. Upon this sleeve is secured a frictioncollar or block 10, constructed, preferably, of wood or other fibrousfrictional material and having' the form of a truncated cone, with anaperture therewith to cause it to tit the sleeve 6. It is placed inposition on said sleeve so that its larger end abuts against the collar8, which it slight] y exceeds in diameter, and is held in position bymeans or' screws 11 passing through said eollar and screwing into thebody of the frictionsleeve.

12 indicates the drivingpinion, which meshes with the g'ear 3 and whichis provided with a frusto-conical bore 13 to tit thecorrespondingly-tapered outer surface of the friction-sleeve 10.

14 indicates a coiled spring encircling the sleeve 6 and bearing at oneend against the pinion l2 to force the same into frictional engagementwith the sleeve or block l0. The

other end of the spring 1li bears against an abutment-collar which iscomposed of two members 15 and 16. The member 15 is threaded internallyto fit upon the threaded portion 9 of the sleeve 6 and may be providedwith a set-screw 17, by means of which it may be firmly locked inposition on said sleeve. The member 15 is further provided with anannular flange 18, extending over and encircling the member 16, saidflange being provided with a plurality of notches or apertures 19,spaced about the same. The member 16 fits loosely on the sleeve 6 and isprovided with a screw 20, which is adapted to engage any desired one ofthe notches 19.l Said member 16 is also provided with an annular flange21 to inclose and form a seat for the abutting end of the spring 14` andwith radial lugs 22, by means of which itmay be more readily rotated.The abutting faces of the members 15 and 16 are provided withsemicircular caminclines 23, (shown more particularly in Figs. 7 and 8,)so that rotation of the member 16 relatively tothe member 15 will forcethe former away from the latter, and thereby compress the spring 14.

rlhe device thus constructed operates in the following manner: The partsbeing assembled in the manner shown in Figs. 1 and 2, thedriving-pinion12 is held by the spring 14 in frictional engagement with thefrictionsleeve 10, so that power will be transmitted from the shaft 4 tothe breaker to operate the latter. In case any hard substance enters thebreaker the pinion 12 will slip upon the friction-sleeve 10,1thuspermitting the shaft 4 to continue to rotate, while the breaker and itsdriving-gear remain stationary, thereby preventing breakage ofthe parts.The frictional engagement ofthe pinion and friction-sleeve may beregulated by adjusting the pressure exerted by the screw 14 through themedium of the abutment-collar. Under ordinary circumstauces'the member15 acts as a fixed collar, and the spring is adjusted by removing thescrew 20'and turning the member 16 to a position which will give thedesired compression to the spring. The member 16 is secured in its newposition by replacing, the screw 20, engaging it, of course, withanother one of the notches 19. As occasion requires this operation maybe repeated. In course of time, however, the spring 14 will become setby long use andwill require more taking up than is provided by theadjustment of the collar 16 relatively to the member 15. When thisoccurs, the member 15is turned upon the sleeve 6 in a direction such asto move it toward the pinion 12, the set-screw 17 being released in caseit is employed. This effects a movement of the entire abutment' towardthe spring and restores or increases'its original compression. Themember 15 may then be secured by the set-screw 17, and 1n case furthercompression of the spring becomes necessary it may be effected byadjusting the collar 16 relatively to the member 15 in the manneralready described. By reason of this construction great nicety ofadjustment of the frictional engagement of the driving-pinion with thefriction-sleeve is obtained` and this adjustment may be varied asdesired to suit different circumstances.

I-do not wish to be understood as limiting myself to the precise detailsof construction hereinbefore described and shown in the accompanyingdrawings, as the same may obviously be modified without departing fromthe principle of my invention. For instance, although I have describedthe sleeve 6 as a driving-sleeve and have referred to the pinion 12 as adriven part it is obvious that these relations depend entirely upon thepoint to which the driving power is applied, and it would constitute nodeparture from the invention if these relations were reversed.Furthermore, it will be seen that while the employment of the sleeve 6is advantageous in that it enables me to construct and assemble thedevice as a whole separate from and ready for application to adriving-shaft said sleeve might be omitted without departing from myinvention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is#

1. A safety coupling or clutch, comprising a driving member providedwith a conical f riction-sleeve, a driven member havinga bore tapered tolit said sleeve, a coiled spring encircling the driving member andbearing at one end against the driven member to force it into contactwith the friction-sleeve, and a two-part abutment for the other end ofsaid spring mounted on the driving member and fixed relatively to saiddriving member when in operation, said abutment being adjustable as awhole longitudinally of said driving' member and comprising two membersor parts, one of which is adjustable relatively to the other,substantially as described.

2. A safety coupling or clutch, comprising a driving member providedwith a conical friction-sleeve, a driven member having a bore tapered tolit said sleeve, a spring encircling the driving member and bearing atone end against.

the driven member to force it into contact with the friction-sleeve,andan abutment for the other end of said spring comprising two parts,one a collar normally secured to the driving member, and the other,against which the spring bears, being a collar revoluble relatively tothe first-'mentioned collar, the abutting faces of said collars being'provided with cam-inclines, and means for preventing relative rotationof said collars, substantially as described.

3. A safety coupling or clutch, comprising a driving member providedwith a conical friction-sleeve, a driven member having a bore tapered tolit said sleeve, a spring encircling the IOO IIO

vessie driving member and bearing at one end against the driven memberto force it into contact with the friction-sleeve, and an abutment forthe other end of said spring comprising two parts, one a collar normallysecured to the driving member and the other, against which the spring'bears, being a collar revoluble relatively to the first-mentionedcollar` the abutting faces of said collars being provided withcam-inclines, and means for preventing relative rotation of saidcollars, said abutment being adjustable as a Whole longitudinally of thedriving member, substantially as described.

4. In a safety coupling or clutch of the character described, thecombination, with a driving member, of a spring-abutment comprising tvvocollars, the one normally secured on the driving member and having anannular iiange provided with a plurality of notches, the other looselymounted on the driving member and provided With a screw to engage anyone of said notches, the abutting faces of said collars being providedwith cam-inclines, substantially as described.

5. In a safety coupling or clutch of the character described, thecombination, with a driving member having a threaded portion, of aspring-abutment comprising a collar threaded to fit the threaded portionof the driving member, and provided with means for securing it inposition thereon, and a second collar loosely mounted on the drivingmember so as to be capable of rotation relatively thereto, the abuttingfaces of said collars being provided with cam-inclines, and means forsecuring the second collar against rotation relatively to the otherparts, substantially as described.

6. A safety coupling or clutch, comprising a driving-sleeve adapted tobe secured on a shaft, a conical frictionsleeve secured on saiddriving-sleeve, a driven member mounted and longitudinally movable onsaid driving-sleeve, and having a bore tapered to lit thefrictionsleeve, a coiled spring encircling said drivingsleeve andbearing at one end against the driven member, and an abutment for theother end of said spring mounted and longitudinally adjustable on thedriving-sleeve, substantially as described.

7. A safety coupling or clutch, comprising a driving-sleeve providedwith a circumferential flange, a conical friction-sleeve litting on saiddriving sleeve and abutting at its larger end against said flange,screws passing' through said flange into said friction-sleeve to holdthe same in place, a driven member having a bore tapered to fit saidsleeve, a spring coiled around the driving-sleeve and bearing at one endagainst said driven member to force it into contact with thefriction-sleeve, and an abutment for the other end of said springmounted and longitudinally adjustable on the driving-sleeve,substantially as described.

In testimony whereof I aiiix my signature in presence of two Witnesses.

ARTHUR A. AMBLER. Witnesses:

IRVINE MILLER, GERTRUDE YOUNG.

